IPv4 to the Internet and network problems in the size of the growing increasingly serious, especially when more and more mobile wireless communications equipment to the Internet, the address space problems are especially important. IPv6 network to provide sufficient address space and in the design and have alter the existing network of IPv4. Discussed the work of the IPv4' s mechanism and functions of the entity and it thus and analyze the problem of the triangle routing problems, and on this basis the work of the mechanisms and principles lPv6 also analyse the advantages. Focus on discussion IPv4's switch to switch to a smooth way rapidly.%针对目前IPv4网络中存在的问题以及网络规模的不断扩大而日益严重,特别是当越来越多的移动无线通信设备加入到Internet中时,地址宅间问题显得尤其重要,IPv6网络能够提供足够的地址空间并且在设计中考虑和修改了现有IPv4网络中的不足.文中讨论IPv4中的工作机制及它的功能实体及它存在三角路由问题,并且分析了三角路由问题产生的原因,在此基础上阐述了IPv6的工作机制及原理,也分析了它的优点.着重讨论了IPv4的切换方式中的快速切换与平滑切换.
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